No abstract

No abstract

No abstract

In this study, a matematerial structure, which consists of rectangular split ring resonator arrays, is investigated numerically and experimentally in the frequency range from 1 GHz to 5GHz. FR-4 material is used as the substrate material due to its low cost. During the numerical analysis (simulation analysis), a parametric study is performed to determine the optimal dimension of the unit cell structure. S11 (reflection coefficient), S21 (transmission coefficient), and n (refractive index) are examined in the frequency range of interest. As a result of the parametric study, the value of n is obtained as approximately zero. By increasing the split ring width, nearzero index is observed at higher frequencies. Hence, it is also deduced that the metamaterial structure behaves as a super lens antenna at the related frequency. Numerical analysis is performed via CST Microwave Studio (MWS). The simulation results are confirmed with experimental results obtained by network analyzer.

Current studies combined optics and photonics provide the most promising materials for potential technological and industrial applications, because of their exciting optical and electronic properties. Metals show a lot of optical phenomena associated with their rich dispersion properties, and are widely used in the range from visible to THz frequencies. In this study, asymmetric transmission properties of 2-D photonic crystals have been studied. The effects of different geometric and optical parameters on the transmission are investigated by using MATLAB and freely available MEEP software based on the FDTD method. A novel structure made of silver is used to manipulate electromagnetic propagation of different wave lengths. The simulation results represent transmittance values for the TM mode where the electromagnetic propagation transverse to the same way of incidence wave. As a result, the best comparative asymmetric transmittance values are obtained as 0.75, and 0.15 from top and bottom sides, respectively.